package com.gc.mapreduce;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import java.io.IOException;

/**
 * Created by Administrator on 2018/11/1.
 */
public class WordCountDriver {
    public static void main(String[] args) {
        try {
            System.setProperty("HADOOP_USER_NAME","root");
            // 1 获取配置信息以及封装任务
            Configuration conf = new Configuration();
            conf.set("fs.defaultFS","hdfs://hadoop1:9000");
            Job job = Job.getInstance(conf);
            // 2 设置jar加载路径
            job.setJarByClass(WordCountDriver.class);
            // 3 设置map和reduce类
            job.setMapperClass(WordCountMapper.class);
            job.setReducerClass(WordCountReduce.class);
            // 4 设置map输出
            job.setMapOutputKeyClass(Text.class);
            job.setMapOutputValueClass(IntWritable.class);
            // 5 设置最终输出kv类型
            job.setOutputKeyClass(Text.class);
            job.setOutputValueClass(IntWritable.class);
            // 6 设置输入和输出路径
            FileInputFormat.setInputPaths(job,new Path(args[0]));
            FileOutputFormat.setOutputPath(job,new Path(args[1]));
            //7、提交
            boolean result = job.waitForCompletion(true);
            System.out.println(result?0:1);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
